Re: [NTG-context] mml

30 Mar 2006

      nico wrote:
...
On Thu, 30 Mar 2006 10:18:32 +0200, Taco Hoekwater   
wrote:
...
Hi nico/Hans,
Hans Hagen wrote:
...
...
<mo> ¯ </mo>
The MathML spec specifically suggests the use of ‾ instead
of a literal accent character in situations like this.
The problem is that it is also specified to which unicode character is  
mapped the entity (http://www.w3.org/TR/MathML2/isodia.html). Actually  
‾ is U00AF.
the messy part is that

- a macron has no stretch
- an overbar has stretch

so, while there is a lot math stuf (now) in unicode, the macron is used 
for an overbar which is rather strange; do they also 'misuse' the 
underscore for underbar etc?

now an implementation needs to adapt to math or text (or just gamble 
since it may be that i want a non stretchable macron over x+y+z); my 
guess is that as a result, many implementations are more complex than needed

(btw, in pure text, it's still not clear if the macro glyph sould be 
chosen or a stretchable hrule)

(i think that one problem of unicode/xml/mathml is that it is used in 
typesetting systems but not in all aspects is designed (or used) to 
facilitate high end results; therefore a 24/32 bit tex still needs to 
provide much detailed control)

Hans

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